Yield components of hydroponically grown pepper treated with biostimulators

Paprika je danas jedna od najčešćih uzgajanih kultura, koja se osim na tlu, sve više uzgaja hidroponski na inertnim supstratima. Prednost hidroponskog uzgoja je u optimalnoj opskrbljenosti biljaka vodom i biljnim hranivima. Primjenom biostimulatora smanjuje se učinak stresnih uvjeta na biljku te pozitivno utječe na otpornost biljke na abiotske i biotske čimbenike stresa, čime se povećava kvaliteta i visina prinosa. Istraživanje je provedeno u negrijanom plasteniku Zavoda za povrćarstvo Agronomskog fakulteta u Zagrebu tijekom 2019. Cilj istraživanja u kojem su testirana četiri hibrida paprike Blanchina, Menta, Vedrana i Rialto) uzgajana uz primjenu biostimulatora Actiwave, Humistar i Phylgreen bio je utvrditi utjecaj biostimulatora na komponente prinosa tretiranih biljaka u odnosu na netretiranu kontrolu. Pokus je postavljen po split plot metodi u tri ponavljanja. Tijekom vegetacije kontinuirano su praćeni mikroklimatski uvijeti zaštićenog prostora, te pH i EC vrijednosti hranive otopine. Tijekom plodonošenja utvrđeni su broj i masa tržnih plodova, tržni prinos te udio netržnih plodova. Iako se očekivalo da će primjena biostimulatora smanjiti negativan utjecaj stresnih uvjeta na sastavnice prinosa, to se nije u potpunosti ostvarilo budući da su u pojedinim slučajevima najbolji rezultati zabilježeni na netretiranim biljkama . Od testiranih kultivara ističu se 'Menta' sa najboljim i 'Rialto' sa najlošijim rezultatima, s tim da su oba kultivara ostvarila najviši prinos uz pri mjenu biostimulatora 'Actiwave'. Ovisno o tretmanu biostimulatorom, sa biljaka kultivara 'Menta' je po m2 ubrano između 34,2 i 52,5 tržnih plodova, mase od 143 do 150 g, što je rezultiralo tržnim prinosom u rasponu od 5055 do 7490 g/m2; udio netržnih plodova bio je u rasponu od 16,9 do 19,2 %, s tim da je najmanje netržnih plodova utvrđeno na kontrolnim, netretiranim biljkama.Today, pepper is one of the most commonly grown crops, which, apart from the soil, is increasingly grown hydroponically on inert substrates. The advantage of hydroponic cultivation is in the optimal supply of plants with water and nutrients. The use of biostimula nts reduces the effect of stress conditions on the plant and has a positiv e effect on the plant's resistance to abiotic and biotic stress factors, thus increasing the quality and yield. The research was conducted in an unheated greenhouse of the Department of Vegetable Crops at the Faculty of Agriculture in Zagreb during 2019. The aim of the study was to determine the effect of biostimulants on the yield components of treated plants relative to untreated control Four pepper hybrids (Blanchina, Menta, Vedrana and Rialto) treated with biostimulants Actiwave, Humistar and Phylgreen were tested. The experiment was set up by the split plot method in three replications. During the vegetation, the greenhouse microclimatic conditions, as well as the pH and EC values of the nutrient solution were continuously monitored. During the harvest period, the number and weight of marketable fruits, market able yield and the share of non marketable fruits were determined. Although was expected that the application of biostimulants will reduce the negative impact of stress conditions on yield componen ts, this was not fully achieved as in some cases the best results were recorded on untreated plants. Between the tested cultivars, 'Menta' with the best and 'Rialto' with the worst results stand out, with both cultivars achieving the highest yield with the use of the biostimula nt 'Actiwave'. Depending on the biostimulant treatment, from ‘Menta’ plants, between 34.2 and 52.5 marketable fruits, weighing 143 to 150 g, were harvested per m 2, resulting in a market able yield ranging from 5055 to 7490 g/m 2 ; the share of non marketable fruits ranged from 16.9 to 19.2%, with the least non marketable fruits determined on control, untreated plants